Improve Wallet and LDK node business logic handling

app/src/main/java/to/bitkit/env/Env.kt

@@ -105,4 +105,5 @@ internal object Env {
 
     const val PIN_LENGTH = 4
     const val PIN_ATTEMPTS = 8
+    const val DEFAULT_INVOICE_MESSAGE = "Bitkit"
 }

app/src/main/java/to/bitkit/fcm/WakeNodeWorker.kt

@@ -24,8 +24,8 @@ import to.bitkit.models.blocktank.BlocktankNotificationType.incomingHtlc
 import to.bitkit.models.blocktank.BlocktankNotificationType.mutualClose
 import to.bitkit.models.blocktank.BlocktankNotificationType.orderPaymentConfirmed
 import to.bitkit.models.blocktank.BlocktankNotificationType.wakeToTimeout
+import to.bitkit.repositories.LightningRepo
 import to.bitkit.services.CoreService
-import to.bitkit.services.LightningService
 import to.bitkit.ui.pushNotification
 import to.bitkit.utils.Logger
 import to.bitkit.utils.withPerformanceLogging
@@ -36,7 +36,7 @@ class WakeNodeWorker @AssistedInject constructor(
     @Assisted private val appContext: Context,
     @Assisted private val workerParams: WorkerParameters,
     private val coreService: CoreService,
-    private val lightningService: LightningService,
+    private val lightningRepo: LightningRepo,
 ) : CoroutineWorker(appContext, workerParams) {
     private val self = this
 
@@ -63,10 +63,8 @@ class WakeNodeWorker @AssistedInject constructor(
 
         try {
             withPerformanceLogging {
-                // TODO: Only start node if it's not running or implement & use StateLocker
-                lightningService.setup(walletIndex = 0)
-                lightningService.start(timeout) { event -> handleLdkEvent(event) }
-                lightningService.connectToTrustedPeers()
+                lightningRepo.start(walletIndex = 0, timeout= timeout) { event -> handleLdkEvent(event) }
+                lightningRepo.connectToTrustedPeers()
 
                 // Once node is started, handle the manual channel opening if needed
                 if (self.notificationType == orderPaymentConfirmed) {
@@ -136,7 +134,7 @@ class WakeNodeWorker @AssistedInject constructor(
                     self.bestAttemptContent?.title = "Payment received"
                     self.bestAttemptContent?.body = "Via new channel"
 
-                    lightningService.channels?.find { it.channelId == event.channelId }?.let { channel ->
+                    lightningRepo.getChannels()?.find { it.channelId == event.channelId }?.let { channel ->
                         val sats = channel.outboundCapacityMsat / 1000u
                         self.bestAttemptContent?.title = "Received ⚡ $sats sats"
                         // Save for UI to pick up
@@ -185,7 +183,7 @@ class WakeNodeWorker @AssistedInject constructor(
     }
 
     private suspend fun deliver() {
-        lightningService.stop()
+        lightningRepo.stop()
 
         bestAttemptContent?.run {
             pushNotification(title, body, context = appContext)

app/src/main/java/to/bitkit/repositories/LightningRepo.kt

@@ -0,0 +1,246 @@
+package to.bitkit.repositories
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.withContext
+import org.lightningdevkit.ldknode.Address
+import org.lightningdevkit.ldknode.BalanceDetails
+import org.lightningdevkit.ldknode.Bolt11Invoice
+import org.lightningdevkit.ldknode.ChannelDetails
+import org.lightningdevkit.ldknode.NodeStatus
+import org.lightningdevkit.ldknode.PaymentDetails
+import org.lightningdevkit.ldknode.PaymentId
+import org.lightningdevkit.ldknode.Txid
+import org.lightningdevkit.ldknode.UserChannelId
+import to.bitkit.di.BgDispatcher
+import to.bitkit.models.LnPeer
+import to.bitkit.models.NodeLifecycleState
+import to.bitkit.services.LdkNodeEventBus
+import to.bitkit.services.LightningService
+import to.bitkit.services.NodeEventHandler
+import to.bitkit.utils.AddressChecker
+import to.bitkit.utils.Logger
+import javax.inject.Inject
+import javax.inject.Singleton
+import kotlin.time.Duration
+
+@Singleton
+class LightningRepo @Inject constructor(
+    @BgDispatcher private val bgDispatcher: CoroutineDispatcher,
+    private val lightningService: LightningService,
+    private val ldkNodeEventBus: LdkNodeEventBus,
+    private val addressChecker: AddressChecker
+) {
+    private val _nodeLifecycleState: MutableStateFlow<NodeLifecycleState> = MutableStateFlow(NodeLifecycleState.Stopped)
+    val nodeLifecycleState = _nodeLifecycleState.asStateFlow()
+
+    suspend fun setup(walletIndex: Int): Result<Unit> = withContext(bgDispatcher) {
+        return@withContext try {
+            lightningService.setup(walletIndex)
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Node setup error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun start(
+        walletIndex: Int,
+        timeout: Duration? = null,
+        eventHandler: NodeEventHandler? = null
+    ): Result<Unit> =
+        withContext(bgDispatcher) {
+            if (nodeLifecycleState.value.isRunningOrStarting()) {
+                return@withContext Result.success(Unit)
+            }
+
+            try {
+                _nodeLifecycleState.value = NodeLifecycleState.Starting
+
+                // Setup if not already setup
+                if (lightningService.node == null) {
+                    val setupResult = setup(walletIndex)
+                    if (setupResult.isFailure) {
+                        _nodeLifecycleState.value = NodeLifecycleState.ErrorStarting(
+                            setupResult.exceptionOrNull() ?: Exception("Unknown setup error")
+                        )
+                        return@withContext setupResult
+                    }
+                }
+
+                // Start the node service
+                lightningService.start(timeout) { event ->
+                    eventHandler?.invoke(event)
+                    ldkNodeEventBus.emit(event)
+                }
+
+                _nodeLifecycleState.value = NodeLifecycleState.Running
+                Result.success(Unit)
+            } catch (e: Throwable) {
+                Logger.error("Node start error", e)
+                _nodeLifecycleState.value = NodeLifecycleState.ErrorStarting(e)
+                Result.failure(e)
+            }
+        }
+
+    suspend fun stop(): Result<Unit> = withContext(bgDispatcher) {
+        if (nodeLifecycleState.value.isStoppedOrStopping()) {
+            return@withContext Result.success(Unit)
+        }
+
+        try {
+            _nodeLifecycleState.value = NodeLifecycleState.Stopping
+            lightningService.stop()
+            _nodeLifecycleState.value = NodeLifecycleState.Stopped
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Node stop error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun sync(): Result<Unit> = withContext(bgDispatcher) {
+        try {
+            lightningService.sync()
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Sync error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun wipeStorage(walletIndex: Int): Result<Unit> = withContext(bgDispatcher) {
+        try {
+            lightningService.wipeStorage(walletIndex)
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Wipe storage error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun connectToTrustedPeers(): Result<Unit> = withContext(bgDispatcher) {
+        try {
+            lightningService.connectToTrustedPeers()
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Connect to trusted peers error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun disconnectPeer(peer: LnPeer): Result<Unit> = withContext(bgDispatcher) {
+        try {
+            lightningService.disconnectPeer(peer)
+            Result.success(Unit)
+        } catch (e: Throwable) {
+            Logger.error("Disconnect peer error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun newAddress(): Result<String> = withContext(bgDispatcher) {
+        try {
+            val address = lightningService.newAddress()
+            Result.success(address)
+        } catch (e: Throwable) {
+            Logger.error("New address error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun checkAddressUsage(address: String): Result<Boolean> = withContext(bgDispatcher) {
+        try {
+            val addressInfo = addressChecker.getAddressInfo(address)
+            val hasTransactions = addressInfo.chain_stats.tx_count > 0 || addressInfo.mempool_stats.tx_count > 0
+            Result.success(hasTransactions)
+        } catch (e: Throwable) {
+            Logger.error("Check address usage error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun createInvoice(
+        amountSats: ULong? = null,
+        description: String,
+        expirySeconds: UInt = 86_400u
+    ): Result<Bolt11Invoice> = withContext(bgDispatcher) {
+        try {
+            val invoice = lightningService.receive(amountSats, description, expirySeconds)
+            Result.success(invoice)
+        } catch (e: Throwable) {
+            Logger.error("Create invoice error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun payInvoice(bolt11: String, sats: ULong? = null): Result<PaymentId> = withContext(bgDispatcher) {
+        try {
+            val paymentId = lightningService.send(bolt11 = bolt11, sats = sats)
+            Result.success(paymentId)
+        } catch (e: Throwable) {
+            Logger.error("Pay invoice error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun sendOnChain(address: Address, sats: ULong): Result<Txid> = withContext(bgDispatcher) {
+        try {
+            val txId = lightningService.send(address = address, sats = sats)
+            Result.success(txId)
+        } catch (e: Throwable) {
+            Logger.error("sendOnChain error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun getPayments(): Result<List<PaymentDetails>> = withContext(bgDispatcher) {
+        try {
+            val payments = lightningService.payments
+                ?: return@withContext Result.failure(Exception("It wasn't possible get the payments"))
+            Result.success(payments)
+        } catch (e: Throwable) {
+            Logger.error("getPayments error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun openChannel(
+        peer: LnPeer,
+        channelAmountSats: ULong,
+        pushToCounterpartySats: ULong? = null
+    ): Result<UserChannelId> = withContext(bgDispatcher) {
+        try {
+            val result = lightningService.openChannel(peer, channelAmountSats, pushToCounterpartySats)
+            result
+        } catch (e: Throwable) {
+            Logger.error("Open channel error", e)
+            Result.failure(e)
+        }
+    }
+
+    suspend fun closeChannel(userChannelId: String, counterpartyNodeId: String): Result<Unit> =
+        withContext(bgDispatcher) {
+            try {
+                lightningService.closeChannel(userChannelId, counterpartyNodeId)
+                Result.success(Unit)
+            } catch (e: Throwable) {
+                Logger.error("Close channel error", e)
+                Result.failure(e)
+            }
+        }
+
+    fun canSend(amountSats: ULong): Boolean = lightningService.canSend(amountSats)
+
+    fun getSyncFlow(): Flow<Unit> = lightningService.syncFlow()
+
+    fun getNodeId(): String? = lightningService.nodeId
+    fun getBalances(): BalanceDetails? = lightningService.balances
+    fun getStatus(): NodeStatus? = lightningService.status
+    fun getPeers(): List<LnPeer>? = lightningService.peers
+    fun getChannels(): List<ChannelDetails>? = lightningService.channels
+
+    fun hasChannels(): Boolean = lightningService.channels?.isNotEmpty() == true
+}